Yep, as whats been said above, without papers, you're the proud owner of a mutt!
Here's my "purebred boxer" (as written on his surrender papers to the shelter where I adopted him):
The people who surrendered him really thought he was "purebred". Except he's several inches taller than any boxer I've met, and he actually has a snout...
Here's my "purebred Pitbull" (also, as per previous owner on her surrender paperwork):
She's a lean 80lbs and considered a "Pitbull" enough that she's muzzled in public, even though she's mostly toothless.
Anyone who is buying something, expecting it to be a "purebred", without seeing proof, papers and parents is risking disappointment.
Your girl is really cute though, and I'm sure you're crazy about her, regardless!